Albania, Kosovo and Macedonia on Friday boosted security measures to prevent terror acts, notably at places of worship over Easter weekend.
In Kosovo, an official who asked not to be named confirmed to AFP local media reports on the arrest of a man suspected of planning an attack.
The authorities were searching for three other people, the official said.
The four are linked to Lavdrim Muhaxhiri, one of the main recruiters and a leading figure for militants from the Balkans going to fight in Syria and Iraq, he added.
